This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A175767 List of pairs of "twin numbers": Omega(n) = Omega(n - 2^Omega(n)), where Omega is A001222. 0

%I

%S 3,5,5,7,6,10,11,13,10,14,17,19,12,20,21,25,22,26,20,28,29,31,34,38,

%T 35,39,24,40,41,43,42,50,44,52,51,55,40,56,59,61,58,62,65,69,71,73,68,

%U 76,70,78,48,80,82,86,87,91,91,95,84,100,101,103,88,104,107,109,102,110,80,112,111

%N List of pairs of "twin numbers": Omega(n) = Omega(n - 2^Omega(n)), where Omega is A001222.

%C The k-primes = numbers that are divisible by exactly k primes (counted with multiplicity).

%F a(2n+1) = A175766(n) = a(2n) + 2^A001222(a(2n+1)).

%e "Twin numbers" are (3, 5), (5, 7), (6, 10), (11, 13), (10, 14), (17, 19), (12, 20), (21, 25), (22, 26), (20, 28), (29, 31), (34, 38), (35, 39), (24, 40), (41, 43), (42, 50), (44, 52), (51, 55), (40, 56), (59, 61), (58, 62), (65, 69), (71, 73), ...

%Y Cf. A175766, A001222, A077800, A175612, A175765.

%K nonn

%O 1,1

%A _Juri-Stepan Gerasimov_, Sep 01 2010

%E Rewritten by _Charles R Greathouse IV_, Sep 03 2010

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified May 21 00:41 EDT 2019. Contains 323427 sequences. (Running on oeis4.)